Q for Mr. Pass -- what are the colored dots on the FETs for? Used in the matching process?

One more: is that large gauge wire from the caps going to the rails speaker wires? I ask this one 'cause I learn from looking at other's pix, and this is a rare opportunity in deed! (and have a ton of speaker wire waiting to be used in a worthy project)

Ah!! Another one if I may push my luck: "No user servicable parts inside" -- must hurt to see that put on every product(Just kidding) seeing how you support us diy'ers